The thing is, both the price cut and the trinity happened in the same quarter. Note that an announcement can already increase sales. There is really no way to tell which was more important, they both happened at the same time.
Here's the graph again:
FY3/2013, the third bar from the left.
There is no way FY3/2012 would be the peak without a price cut. There is a reason that happened, I even showed you shipment data where they only shipped 700k 3DS units after launch.
If software was the only reason sales increased, then the Wii U wouldn't have been DEAD. It also got the big Nintendo first party titles but that didn't do shit to save it.
For 3DS, the price cut was very significant. Nintendo took the losses because they were trying to save it since it's their more important hardware at making revenue with smaller budget games compared to the Wii U.